A demeaning term for a 6 year-old, or a 6th grader. Used with terms such as, annoying, irritating, etc.
"God, what an annoying Sixlet."
"Don't be mean, you were one too you know!"
by The Noid November 29, 2007
Can only be used if you are in a higher grade than 6th, used to call a six grader
"Six-lets are gettin smaller and smaller every year!"
by Mitchell Brown April 05, 2007

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